Tensile Strength Of Self-compacting Concrete Research Articles

Study on the tensile strength of plastic fiber reinforced M20 grade self-compacting bacterial concrete using a novel microbial technique Microbial induced calcite precipitation

Aim: The objective of this study is to quantify the influence of plastic fiber on the tensile strength of self-compacting concrete using a novel microbial technique Microbial induced calcite precipitation. Materials and Methods: There are 2 groups taken for the study and a total of 18 samples were prepared per group with Gpower (80%). Group-1 refers to the conventional self-healing concrete and group-2 refers to the plastic fiber reinforced self-compacting. concrete. The number of samples was calculated using clinical software by adopting the values from previously published research papers. The independent sample T-test has been carried out using SPSS software version 21 which shows a clear increment in the tensile strength of the fiber reinforced self-compacting concrete. Result: Tensile strength of plastic fiber reinforced self-compacting concrete increased by 3.73% when compared with the normal self-compacting concrete. The standard deviation of the tensile strength of plastic reinforced bacterial concrete was 0.28965. A significant difference between the two groups was observed with a p-value of 0.010 (p<0.05) Conclusion: From this experimental study it is concluded that the plastic fiber reinforced M20 grade self-healing concrete has greater tensile strength than the normal self-compacting concrete.

EFFECTS OF WASTE STEEL FIBRES ON THE MECHANICAL PROPERTIES OF MODIFIED SELF COMPACTING CONCRETE

Waste Steel Fibre (WSF) and Rice Husk Ash (RHA) were used in the production of Self Compacting Concrete (SCC). Seven variants of SCC mixes were prepared. The rheological and mechanical properties (Compressive Strength (CS) and Split Tensile Strength (STS)) of the SCC produced were examined. The results showed that the blocking ratio varied marginally while other fresh properties of the SCC with WSF compared favourably to the standard. The CS of the hardened control samples after 56 days of curing was 36.18 N/mm2 while the CS of SCC with 15 % of RHA and 0.0 %-0.5 % of WSF, ranged from 37.04 - 43.64 N/mm2 with the maximum CS at 0.4 % WSF addition. Similarly, the STS of SCC at 56 days improved with an increase in WSF content up to 0.4 % and decreased with further addition of WSF. The inclusion of WSF at the optimum level of 0.4 % addition had a better influence on the tensile strength of SCC thereby increasing the ratio of STS to CS.

Development of Self-Compacting Concrete of Grades M25, M30 and M35 Using Composite Cement

Abstract: Both fly ash and slag are industrial by-products and their disposal has become a serious environmental problem. Considering their excellent cementitious properties, their utilization in the cement industry becomes crucial. Because of the significant contribution to the environmental pollution, over dependency on cement has to be reduced. There is a need to economize the use of cement, thus, the concept of composite cement becomes necessary. In this study, Fly Ash (FA) and Ground Granulated Blast Furnace Slag (GGBFS) were used as partial replacement of cement to improve the properties of selfcompacting concrete (SCC). Three SCC grades viz., M25, M30 and M35 were made in the laboratory. For all the three grades, two variations were considered. Case 1 included 65% Ordinary Portland Cement (OPC), 15% FA and 20% GGBFS while case 2 included 85% OPC and 15% FA. In order to improve the workability of SCC, certain amount of super-plasticizer was added in the design mix. Vfunnel, L-box and slump flow tests were conducted on fresh SCC whereas compressive strength, flexural strength and split tensile tests were performed on hardened SCC. The results showed that the optimum admixture content was used their respective grades and cases leading to negligible segregation. Moreover, all the design mixes satisfied the SCC workability conditions comfortably. It was concluded that by replacing cement partially with fly ash and GGBFS in percentages mentioned in cases 1 and 2, the tensile strength of SCC could improve. From the 28 days results obtained from the compressive strength test, it was inferred that 15% fly ash and 20% GGBFS could be partially replaced with cement for all the grades i.e., M25, M30 and M35. This, could help in reducing the reliance on cement, and utilizing the industrial by-products in a better way. Keywords: Self-Compacting Concrete (SCC); Ordinary Portland cement (OPC); Fly Ash (FA); Ground Granulated Blast Furnace Slag (GGBFS); Workability; V-funnel; L-box; slump flow; compressive strength test; split tensile strength; flexural strength

Effect of Design Parameters on Compressive and Split Tensile Strength of Self-Compacting Concrete with Recycled Aggregate: An Overview

One of the prime objectives of this review is to understand the role of design parameters on the mechanical properties (Compressive and split tensile strength) of Self-Compacting Concrete (SCC) with recycled aggregates (Recycled Coarse Aggregates (RCA) and Recycled Fine Aggregates (RFA)). The design parameters considered for review are Water to Cement (W/C) ratio, Water to Binder (W/B) ratio, Total Aggregates to Cement (TA/C) ratio, Fine Aggregate to Coarse Aggregate (FA/CA) ratio, Water to Solid (W/S) ratio in percentage, superplasticizer (SP) content (kg/cu.m), replacement percentage of RCA, and replacement percentage of RFA. It is observed that with respect to different grades of SCC, designed parameters affect the mechanical properties of SCC with recycled aggregates.

Impact of Design Parameters on the Ratio of Compressive to Split Tensile Strength of Self-Compacting Concrete with Recycled Aggregate.

Most concrete studies are concentrated on mechanical properties especially strength properties either directly or indirectly (fresh and durability properties). Hence, the ratio of split tensile strength to compressive strength plays a vital role in defining the concrete properties. In this review, the impact of design parameters on the strength ratio of various grades of Self-Compacting Concrete (SCC) with recycled aggregate is assessed. The design parameters considered for the study are Water to Cement (W/C) ratio, Water to Binder (W/B) ratio, Total Aggregates to Cement (TA/C) ratio, Fine Aggregate to Coarse Aggregate (FA/CA) ratio, Water to Solid (W/S) ratio in percentage, superplasticizer (SP) content (kg/cu.m), replacement percentage of recycled coarse aggregates (RCA), replacement percentage of recycled fine aggregates (RFA), fresh density and loading area of the specimen. It is observed that the strength ratio of SCC with recycled aggregates is affected by design parameters.

Comparative of the Use of Carbon and Steel Fiber to the Mechanical Properties of Self Compacting Concrete

This research is a comparative study, the use of carbon fiber and steel fiber for Self-Compacting Concrete (SCC). In previous studies, it was proven that the addition of steel fibers can increase the compressive and tensile strength of SCC. While carbon fiber is one of the most widely used materials for structural reinforcement in recent years. Therefore it is necessary to do a comparative study of the use of carbon fiber if applied to SCC. The percentage increase in carbon fiber and steel is 0.5%, 1%, and 1.5%. Then do the testing of: slump test, compressive strength, tensile strength and flexural strength. The results showed the optimal percentage of steel fiber addition of 1.5%, can increase the compressive strength of SCC by 11%. However carbon fiber and steel do not increase the tensile strength of SCC, and tend to reduce flexural strength. Other results show that carbon fiber is not suitable for use in SCC.

Modulus of elasticity and tensile strength of self-compacting concrete: Survey of experimental data and structural design codes

To enable an overall view on the mechanical performance of Self-Compacting Concrete (SCC), a database was constructed. Included within this database are informations with regard to: mix-design, fresh and hardened properties. This dataset contains results of more than 250 papers, of researches conducted worldwide on SCC during the last two decades.In this paper, an in depth analyses is provided on the modulus of elasticity and the tensile strength of SCC. The SCC results collected within the database are compared with those predicted from the formulations and existing models developed and validated for vibrated concrete (e.g. Eurocode 2 and the Model Code (MC 90 and/or MC 2010)). The influences of different mix-design parameters (aggregate type, paste volume, etc.) on the E-modulus and the tensile strength are analysed, and a more detailed view on the performance of SCC, and the different models, is obtained.

Mechanical Properties of Fiber Reinforced Self-Compacting Concrete

The mechanical strengths of self-compacting concrete (SCC) with different strengths and different fibers were investigated. By mechanics performance testing on concrete samples, it shows that the fiber can significantly reduce strength of the self-compacting concrete during curing period. The 28d tensile strength of self-compacting concrete can be improved when steel fiber, polypropylene fiber, or polyethylene fiber were used. Moreover, steel fiber can improve the 28d compressive strength; contrarily, polypropylene fiber and polyethylene fiber can reduce the 28d compressive strength.

Predicting the indirect tensile strength of self-compacting concrete using artificial neural networks

This paper concentrates on the results of experimental work on tensile strength of self-compacting concrete (SCC) caused by flexure, which is called rupture modulus. The work focused on concrete mixes having water/binder ratios of 0.35 and 0.45, which contained constant total binder contents of 500 <TEX>$kg/m^3$</TEX> and 400 <TEX>$kg/m^3$</TEX>, respectively. The concrete mixes had four different dosages of a superplasticizer based on polycarboxylic with and without silica fume. The percentage of silica fume that replaced cement in this research was 10%. Based upon the experimental results, the existing equations for anticipating the rupture modulus of SCC according to its compressive strength were not exact enough. Therefore, it is decided to use artificial neural networks (ANN) for anticipating the rupture modulus of SCC from its compressive strength and workability. The conclusion was that the multi layer perceptron (MLP) networks could predict the tensile strength in all conditions, but radial basis (RB) networks were not exact enough in some circumstances. On the other hand, RB networks were more users friendly and they converged to the final networks quicker.

Effects of specimen size and shape on compressive and tensile strengths of self-compacting concrete with or without fibres

Self-compacting concrete (SCC) can be placed and compacted under its own weight. Modifications in the mix design of SCC may significantly influence the material's mechanical properties. Therefore, it is vital to investigate whether all the assumed hypotheses about conventional concrete also hold true for SCC structures. This paper discusses an experimental programme that was carried out to study the effects of specimen size and shape on the compressive and tensile strength of SCC and fibre reinforced SCC. For this purpose, cube specimens with 100 and 150 mm dimensions and cylinder specimens with 100 × 200 and 150 × 300 mm dimensions were casted. The experimental programme examined four SCC mixtures: plain SCC, and steel-, polypropylene- and hybrid-fibre reinforced SCC. Compressive and tensile strengths were tested after 3, 7, 14, 28 and 56 days. The paper also investigates correlations between compressive and tensile strengths and the size and shape of the specimen.

RETRACTED ARTICLE: The effects of ZnO2 nanoparticles on split tensile strength of self-compacting concrete

We the Editor and Publisher of Journal of Experimental Nanoscience retract the following three articles:1. Nazari, Ali, and Shadi Riahi. “The effects of ZnO2 nanoparticles on split tensile strength of self-compacting concrete.” Journal of Experimental Nanoscience 7.5 (2012): 491-512, https://www.tandfonline.com/doi/full/10.1080/17458080.2010.524669 2. Nazari, Ali, and Shadi Riahi. “The effects of SnO2 nanoparticles on physical and mechanical properties of high-strength self-compacting concrete.” Journal of Experimental Nanoscience 7.5 (2012): 559-577, https://www.tandfonline.com/doi/full/10.1080/17458080.2010.543991 3. Nazari, Ali, and Shadi Riahi. “The effects of ZrO2 nanoparticles on strength assessments and water permeability of concrete in different curing media.” Journal of Experimental Nanoscience 8.4 (2013): 413-433, https://www.tandfonline.com/doi/full/10.1080/17458080.2011.586369 Since publication it has come to our attention that these articles duplicate significant parts of other papers published elsewhere and that these were not referenced within these articles (listed above). Following COPE guidelines, Taylor & Francis has tried numerous times to contact the authors as well as their affiliated institutes with a request for clarification, however, we failed to receive a response.As we have been able to verify that unreferenced content has been duplicated, we have decided to retract these articles. We apologize to the readers that this was not detected during the submission process.We have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines on retractions.The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as “Retracted”.

RETRACTED ARTICLE: The effects of ZrO2 nanoparticles on strength assessments and water permeability of concrete in different curing media

We the Editor and Publisher of Journal of Experimental Nanoscience retract the following three articles:1. Nazari, Ali, and Shadi Riahi. “The effects of ZnO2 nanoparticles on split tensile strength of self-compacting concrete.” Journal of Experimental Nanoscience 7.5 (2012): 491-512, https://www.tandfonline.com/doi/full/10.1080/17458080.2010.524669 2. Nazari, Ali, and Shadi Riahi. “The effects of SnO2 nanoparticles on physical and mechanical properties of high-strength self-compacting concrete.” Journal of Experimental Nanoscience 7.5 (2012): 559-577, https://www.tandfonline.com/doi/full/10.1080/17458080.2010.543991 3. Nazari, Ali, and Shadi Riahi. “The effects of ZrO2 nanoparticles on strength assessments and water permeability of concrete in different curing media.” Journal of Experimental Nanoscience 8.4 (2013): 413-433, https://www.tandfonline.com/doi/full/10.1080/17458080.2011.586369 Since publication it has come to our attention that these articles duplicate significant parts of other papers published elsewhere and that these were not referenced within these articles (listed above). Following COPE guidelines, Taylor & Francis has tried numerous times to contact the authors as well as their affiliated institutes with a request for clarification, however, we failed to receive a response.As we have been able to verify that unreferenced content has been duplicated, we have decided to retract these articles. We apologize to the readers that this was not detected during the submission process.We have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines on retractions.The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as “Retracted”.

RETRACTED ARTICLE: The effects of SnO2 nanoparticles on physical and mechanical properties of high-strength self-compacting concrete

We the Editor and Publisher of Journal of Experimental Nanoscience retract the following three articles:1. Nazari, Ali, and Shadi Riahi. “The effects of ZnO2 nanoparticles on split tensile strength of self-compacting concrete.” Journal of Experimental Nanoscience 7.5 (2012): 491-512, https://www.tandfonline.com/doi/full/10.1080/17458080.2010.524669 2. Nazari, Ali, and Shadi Riahi. “The effects of SnO2 nanoparticles on physical and mechanical properties of high-strength self-compacting concrete.” Journal of Experimental Nanoscience 7.5 (2012): 559-577, https://www.tandfonline.com/doi/full/10.1080/17458080.2010.543991 3. Nazari, Ali, and Shadi Riahi. “The effects of ZrO2 nanoparticles on strength assessments and water permeability of concrete in different curing media.” Journal of Experimental Nanoscience 8.4 (2013): 413-433, https://www.tandfonline.com/doi/full/10.1080/17458080.2011.586369 Since publication it has come to our attention that these articles duplicate significant parts of other papers published elsewhere and that these were not referenced within these articles (listed above). Following COPE guidelines, Taylor & Francis has tried numerous times to contact the authors as well as their affiliated institutes with a request for clarification, however, we failed to receive a response.As we have been able to verify that unreferenced content has been duplicated, we have decided to retract these articles. We apologize to the readers that this was not detected during the submission process.We have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines on retractions.The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as “Retracted”.

The Effect of Filler Types and Superplastizier on the Workability and Splitting Tensile Strength of Self-Compacting Concrete

AbstraAbstract Self-compacting concrete (SCC) is a special type of concrete that can flow through intricate geometrical configurations under its own mass without external or internal vibration or segregation. The objectives of the research work were to evaluate the effects of filler types (silica fume and limestone dust) and high- range water- reducing agent, (HRWRA, superplastizier-type Sikament -163) on the workability and splitting tensile strength of SCC. The experimental results showed the using silica fume and limestone dust in Self-compacting concrete led to a considerable improvement in splitting tensile strength. As the percentage of limestone powder and silica fume increases, the workability properties of SCC slightly decreased with increases in splitting tensile strength. The workability properties of SCC for all the replacements satisfy the recommended values given by specifications. Keywords: self-compacting concrete, silica fume, limestone dust, fillers, strengths, splitting, super plasticizers